/**
 * 虚拟滚动系统
 */
export class VirtualScroll {
  private readonly viewportHeight: number
  private readonly rowHeight: number
  private readonly totalRows: number
  private readonly scrollTop: number

  getVisibleRange (): { start: number, end: number } {
    const start = Math.floor(this.scrollTop / this.rowHeight)
    const end = Math.min(
      start + Math.ceil(this.viewportHeight / this.rowHeight) + 2,
      this.totalRows
    )
    return { start, end }
  }

  // 其他方法：处理滚动事件、动态行高计算等
}
